Is it possible to setup up and had so that meshes from ue4 can be used to boolean geo within the had asset?

For instance let's say I have a building and would like to boolean a hole through it. Could my had be setup so I can select say a brush or static mesh in ue4, select it in the hda, then intersect it with the model in the hda to boolean?

Alternatively could an approach be to allow a curve to be exposed within the hda so for each instance of that hda the user can add / delete / manipulate points of this curve in the hda, possibly with it already extruded to give it depth, and then use this to create a unique boolean for each instance of the hda?

Thanks.